[1] BEBERNES J. W.:
Periodic boundary value problems for systems of second order differential equations. J. Differential Equations 13 (1973), 32-47.
MR 0340700 |
Zbl 0284.34016
[2] FECKAN M.:
Positive solutions of a certain type of two-point boundary value problem. Math. Slovaca 41 (1991), 179-187.
MR 1108580
[3] FULIER J.:
On a nonlinear two-point boundary value problem. Acta Math. Univ. Comenian. LVIII-LIX (1990), 17-35.
MR 1120353
[4] GAINES R. E.-SANTANILLA J.:
A coincidence theorem in convex sets with applications to periodic solutions of ordinary differential equations. Rocky Mountain J. Math. 12 (1982), G69-G78.
MR 0683861 |
Zbl 0508.34030
[5] GREGUŠ M.-ŠVEC M.-ŠEDA V.: Ordinary Differential Equations. Alfa, Bratislava, 1985.
[G] HALE J. K.:
Ordinary Differential Equations. Wiley-Interscience, New York, 19G9.
MR 0419901
[7] NIETO J. J.:
Existence of solutions in a cone for nonlinear alternative problems. Proc. Amer. Math. Soc. 94 (1985), 433-436.
MR 0787888 |
Zbl 0585.47050
[8] MARTIŠOVITŠ I.:
Existence of positive solutions to vector boundary value problems I. Math. Slovaca 49 (1999), 453-479.
MR 1719739 |
Zbl 0952.34017